Main modulation calibration using control main valve

摘要

Various embodiments of methods, apparatus and systems that calibrate main modulation of an electro-hydraulic control system for a vehicle transmission are presented. Some embodiments calibrate regulator control signals that cause a main regulator valve to develop a main line pressure based upon status of a control main valve that develops a control main pressure based upon the main line pressure.

主权项

1. An electro-hydraulic control system for a transmission, comprising
a main regulator valve to modulate a main line pressure of fluid of the electro-hydraulic control system based upon regulator control signals, a control main valve to receive fluid at the main line pressure, to develop a control main pressure based upon the main line pressure, and to generate a status signal that indicates whether the control main valve is in a regulating state due to the main line pressure, a clutch trim valve to exert a clutch feed pressure upon a clutch of the transmission based upon fluid received at the control main pressure, fluid received at the main line pressure, and a clutch control signal, and an electronic control module to generate regulator control signals, to detect via the status signal whether the control main valve is in the regulating state, and to calibrate the regulator control signals based upon the regulator control signals associated with the control main valve entering or leaving the regulating state.